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Table 3 Correlations Between CASIS and Other PRO Measures--COPD Sample: Baseline Data

From: Development and psychometric assessment of the COPD and Asthma Sleep Impact Scale (CASIS)

PRO Measure Spearman Correlation
Number of bad days1 0.61
Overall Health Status 0.50
LCOPD 0.58
SGRQ--Symptoms 0.57
SGRQ--Activities 0.53
SGRQ--Impact 0.65
SGRQ--Total Score 0.68
  1. 1 Number of bad days in the past week
  2. All correlations significant at p < 0.0001